html,
body {
    width: 100%;
    height: 100%;
    position: relative;
}
html .mask{
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,.5);
    position: absolute;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99;
}
html .mask .close{
    position: absolute;
    right: 0;
    top: 0;
    width: 50px;
    height: 50px;
    color: #fff !important;
    border-radius: 25px;
    cursor: pointer;
    margin: 50px;
    border: 4px solid #fff !important;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99;
}
html .mask img{
    max-height: 500px;
    object-fit: cover;
}
body {
    overflow-y: auto;
}

*::-webkit-scrollbar {
    /*滚动条整体样式*/
    width: 10px;
    /*高宽分别对应横竖滚动条的尺寸*/
    height: 1px;
}

*::-webkit-scrollbar-thumb {
    /*滚动条里面小方块*/
    border-radius: 10px;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
    background: #535353;
}

*::-webkit-scrollbar-track {
    /*滚动条里面轨道*/
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    background: #ededed;
}
header{
    position: sticky;
    top: 0;
    z-index: 99;
}

footer{
    text-align: center;
    position: fixed;
    width: 100%;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
}
footer a{
    color: #fff;

}
.toTop{
    position: fixed;
    /* z-index: 99; */
    left: 40px;
    bottom: 40px;
    cursor: pointer;
    width: 50px;
    height: 50px;
    background-color: cornflowerblue;
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(0, 0, 0,.5);
    text-align: center;
    line-height: 50px;
    color: #fff;
}

.fl{
    float: left;
}
.fr{
    float: right;
}
.clearfix:after{
    content: '';
    display: block;
    clear: both;
    height: 0;
}
.clearfix{
    zoom: 1;
}


